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No, Ashan (or Aslan) is indeed a completely new world. Everything can be done without ignoring the history of Might & Magic. According to my theory (it seems Demilich thinks the same way), Ashan is a planet located at some distance from the domains of the Ancients and the Creators. A planet with a moon (like Earth with the Moon), but Ashan has a major anomaly. Even before its appearance in that star system, there were many distortions and curvatures of space on its outskirts. When Ashan appeared in that system, it fell into that anomaly and stopped rotating, as did its moon. These distortions somehow isolated it from the rest of the Universe; the global physical laws within it are slightly different, and after this world became anomalous, it essentially ceased to be a world in the literal sense of the word. Having fallen into the spatial distortions, it turned into a cluster of unknown substance (or energy), from which the Cosmic Egg appeared (more on this in the Chronology of Ashan), from which two first dragons were born: Asha (or Asla) - the Dragon of Order and the progenitor of the Elemental Dragons (the gods of Ashan) and Urgash - the Dragon of Chaos and the creator of demons, brother and sister.
The fact is that in the corrections to Demilich's history, I added a point about isolation from the rest of the Universe (I simply stated that Ashan is isolated by an unknown veil from the rest of the Universe). It was just not immediately clear from the first paragraph of Ashan's history that Ashan is a separate universe (although Demilich wrote "hidden from the all-seeing eyes of higher powers").